Malicious PDF — malware analysis report

Static analysis result for SHA-256 d631d24a6517f592…

MALICIOUS

PDF

79.5 KB Created: 2021-09-11 17:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c754302e326be77badc8fe63882b03b SHA-1: eae364fe17f67d906c1687d9f11056b1ba185dfa SHA-256: d631d24a6517f5929cc2754e20f8540141b55fbd30446c43e08b3cd2557bcbc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous unknown URLs suggest the document acts as a link farm, likely directing users to phishing sites or malware downloads. The embedded URLs, despite some being marked as benign, are part of a broader pattern of suspicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ambvet-trefontane.eu/userfiles/files/38242701057.pdf In PDF document text
    • https://graveyards-fuj.ae/userfiles/files/16108676823.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/bigajebotimoxikud.pdfIn PDF document text
    • http://polipack.ru/content/file/najusipof.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/86106386843.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9c92af24---pogizozifek.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/muwefetizofotivewa.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/metosanezoz.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210905074629.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/88221657693.pdfIn PDF document text
    • http://underbutter.cz/download/foto/zawutelixapunigukav.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/23325708460.pdfIn PDF document text
    • http://taigesw.com/upload/files/dovujanenejuwojep.pdfIn PDF document text
    • http://szcftz.com/upload/xavufimesenolabutubebubu.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210904031500.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/bapuvokomub.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tamawinipobavebusafazode.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/lizetot.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/70205954956.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/kugotuzuzutan.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/zigexabom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=game+store+app+download+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 17412 bytes
SHA-256: a67ac61c9574fa4085943deaaaf3d2d5f8a14a6af8d18289c9d22a758ceac699
font_02_sfnt_off00011813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11813 10680 bytes
SHA-256: e59bc3d70c36f2ce2641d90f3041f91dfce86096c89fc0f730caf084ddc25f9a

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